ייִדישער מחשבֿה אויף יואל 2:11

וַֽיהוָ֗ה נָתַ֤ן קוֹלוֹ֙ לִפְנֵ֣י חֵיל֔וֹ כִּ֣י רַ֤ב מְאֹד֙ מַחֲנֵ֔הוּ כִּ֥י עָצ֖וּם עֹשֵׂ֣ה דְבָר֑וֹ כִּֽי־גָד֧וֹל יוֹם־יְהוָ֛ה וְנוֹרָ֥א מְאֹ֖ד וּמִ֥י יְכִילֶֽנּוּ׃

און גאָט לאָזט אַרױס זײַן קָול פֿאַרױס פֿאַר זײַן חיל; װאָרום זײער גרױס איז זײַן מחנה, װאָרום מאַכטיק איז דער װאָס טוט זײַן באַפֿעל; װאָרום גרױס איז דער טאָג פֿון גאָט און מוֹראדיק זײער, און װער קען אים אױסהאַלטן?

Akeidat Yitzchak

A Midrash quoted in Menorat Hama-or states "G'd roared aloud at the head of His army," (Yoel 2, 11) that this refers to Rosh Hashanah, that the words "for His camp is very great" refers to Israel, "numberless are those who do His bidding for great is the day of the Lord and very frightening," refers to the Day of Atonement as stated by Rabbi Kruspadai "three books are open before Him on the day of judgment."
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Guide for the Perplexed

Let us now consider the words of Joel (iii. 3-5): “And I will show wonders in the heavens and in the earth, blood and fire, and pillars of smoke. The sun shall be turned into darkness, and the moon into blood, before the great and terrible day of the Lord come. And it shall come to pass, that whosoever shall call on the name of the Lord shall be delivered, for in Mount Zion and in Jerusalem shall be deliverance,” etc. I refer them to the defeat of Sennacherib near Jerusalem; but they may be taken as an account of the defeat of Gog and Magog near Jerusalem in the days of the Messiah, if this appears preferable, although nothing is mentioned in this passage but great slaughter, destruction, fire, and the diminution of the light of the two luminaries. You may perhaps object: How can the day of the fall of Sennacherib, according to our explanation, be called “the great and the terrible day of the Lord?” But you must know that a day of great salvation or of great distress is called “the great and terrible day of the Lord.” Thus Joel (ii. 11) says of the day on which the locusts came over the land, “For the day of the Lord is great and terrible, and who can abide it?”
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Guide for the Perplexed

The case that the will of an animal or its desire for some of its natural wants is the cause of some event, may be illustrated by the following instance: “And God spake unto the fish, and it vomited out Jonah” (ii. 11). The act is ascribed to God, because He gave the fish the will, and not because He made it a prophet or endowed it with a prophetical spirit. Similarly it is said of the locusts that appeared in the days of Joel, son of Pethuel, “Mighty is he that accomplishes his word” (Joel 2:11); or of the beasts that took possession of the land of Edom when destroyed in the days of Sennacherib, “He cast lot for them, and his hand divided it unto them by a line” (Isa. 34:27). Although here the verbs “to say,” “to command,” “to send,” are not used, the meaning is evidently the same, and you must explain all passages that are analogous to it in a similar manner.
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